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A067089 Floor[X/Y] where X = concatenation of (2n), (2n-1), ... down to n+1 and Y = concatenation of n, n-1, n-2, ... down to 1. 9
2, 2, 2, 2, 2, 185, 18461, 1842626, 183987603, 1837682236, 1999303871, 2000827643, 2000777468, 2000722020, 2000673854, 2000631711, 2000594530, 2000561482, 2000531914, 2000505305, 2000481231, 2000459347, 2000439367 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..22.

EXAMPLE

a(6)= floor [ 121110987/654321] = [185.094146451053840546153951959359]=185.

MATHEMATICA

f[n_] := (k = 1; x = y = "0"; While[k < n + 1, x = StringJoin[x, ToString[2n - k + 1]]; y = StringJoin[ToString[2k - 1], y]; k++ ]; Return[ Floor[10* ToExpression[x] / ToExpression[y]]] ); Table[ f[n], {n, 1, 25} ]

  fd[st_, en_]:=FromDigits[Flatten[IntegerDigits/@Range[st, en, -1]]]; Table[ Floor[fd[2n, n+1]/fd[n, 1]], {n, 30}] (* Harvey P. Dale, Jul 04 2013 *)

CROSSREFS

Cf. A067088.

Sequence in context: A056993 A057331 A270374 * A090872 A283472 A225538

Adjacent sequences:  A067086 A067087 A067088 * A067090 A067091 A067092

KEYWORD

easy,base,nonn

AUTHOR

Amarnath Murthy, Jan 07 2002

EXTENSIONS

More terms from Robert G. Wilson v, Jan 09 2002

STATUS

approved

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Last modified March 28 07:59 EDT 2020. Contains 333079 sequences. (Running on oeis4.)